Pentafluorosulfur imino heterocyclic compounds as BACE-1 inhibitors, compositions, and their use

1. A compound, or a pharmaceutically acceptable salt thereof, said compound having the structural Formula (I):

wherein:

W is selected from the group consisting of —C(O)—, —C(S)—, and —C(═NR 8A )—;

-L 1 - is present or absent and when present represents a divalent moiety selected from the group consisting of -alkyl-, -haloalkyl-, -heteroalkyl-, -alkenyl-, and -alkynyl-;

-L 2 - is present or absent and when present represents a divalent moiety selected from the group consisting of -alkyl-, -haloalkyl-, -heteroalkyl-, -alkenyl-, and -alkynyl-;

each -L 3 - independently is present or absent and when present represents a divalent moiety independently selected from the group consisting of -alkyl-, -haloalkyl-, -heteroalkyl-, -alkenyl-, -alkynyl-, —N(R 7 )—, —NHC(O)—, and —C(O)NH—;

m, n, p, q, and r are each independently selected integers, wherein:

m is 0 or more;

n is 0 or more;

p is 0 or more;

q is 0, 1, or 2;

r is 0, 1, or 2, with the provisos that:

(i) the maximum value of the sum of m, n, and q is the maximum number of available substitutable hydrogen atoms on ring A,

(ii) the maximum value of the sum of p and r is the maximum number of available substitutable hydrogen atoms on ring B, and

(iii) the sum of q and r is 1 or 2;

R 1 is selected from the group consisting of: H, alkyl, haloalkyl, heteroalkyl, heterohaloalkyl, cycloalkyl, cycloalkylalkyl-, heterocycloalkyl, heterocycloalkylalkyl-, aryl, arylalkyl-, heteroaryl, and heteroarylalkyl-,

wherein each of said alkyl, haloalkyl, heteroalkyl, heterohaloalkyl, cycloalkyl, cycloalkylalkyl-, heterocycloalkyl, heterocycloalkylalkyl-, aryl, arylalkyl-, heteroaryl, and heteroarylalkyl- of R 1 is unsubstituted or substituted with one or more independently selected R 10 groups;

R 2 is selected from the group consisting of H, halo, alkyl, and haloalkyl, wherein each of said alkyl and said haloalkyl of R 2 is unsubstituted or substituted with one or more independently selected R 10 groups;

R 3 is selected from the group consisting of H, halo, alkyl, and haloalkyl, wherein each of said alkyl and said haloalkyl of R 2 is unsubstituted or substituted with one or more independently selected R 10 groups;

R 4 is selected from the group consisting of alkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, and heterocycloalkenyl,

wherein each of said alkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, and heterocycloalkenyl of R 4 is unsubstituted or substituted with one or more independently selected R 10 groups;

ring A is selected from the group consisting of monocyclic aryl, monocyclic heteroaryl, monocyclic cycloalkyl, monocyclic cycloalkenyl, monocyclic heterocycloalkyl, monocyclic heterocycloalkenyl, and a multicyclic group;

each ring B (when present) is independently selected from the group consisting of monocyclic aryl, monocyclic heteroaryl, monocyclic cycloalkyl, monocyclic cycloalkenyl, monocyclic: heterocycloalkyl, monocyclic heterocycloalkenyl, and a multicyclic group;

each R 5 (when present) is independently selected from the group consisting of halo, —CN, —NO 2 , —Si(R 6 ) 3 , —P(O)(OR 7 ) 2 , —P(O)(OR 7 )(R 7 ), —N(R 8 ) 2 , —NR 8 C(O)R 7 , —NR 8 S(O) 2 R 7 , —NR 8 C(O)N(R 8 ) 2 , —NR 8 C(O)OR 7 , —C(O)R 7 , —C(O) 2 R 7 , —C(O)N(R 8 ) 2 , —S(O)R 7 , —S(O) 2 R 7 , —S(O) 2 N(R 8 ) 2 , —OR 7 , —SR 7 , alkyl, haloalkyl, haloalkoxy, heteroalkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl,

wherein each said alkyl, haloalkyl, haloalkoxy, heteroalkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl of R 5 (when present) is optionally independently unsubstituted or further substituted with one or more independently selected groups selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower heteroalkyl, halo, —CN, —NO 2 , —N(R 8 ) 2 , —C(O)N(R 8 ) 2 , and cycloalkyl;

each R 6 (when present) is independently selected from the group consisting of alkyl, aryl, arylalkyl-, haloalkyl, cycloalkyl, cycloalkylalkyl-, heteroaryl, and heteroarylalkyl-;

each R 7 (when present) is independently selected from the group consisting of H, alkyl, alkenyl, heteroalkyl, haloalkyl, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, cycloalkyl, cycloalkylalkyl-, heterocycloalkyl, and heterocycloalkylalkyl-;

each R 8 (when present) is independently selected from the group consisting of H, alkyl, alkenyl, heteroalkyl, haloalkyl, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, cycloalkyl, cycloalkylalkyl-, heterocycloalkyl, and heterocycloalkylalkyl-;

R 8A is selected from the group consisting of alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, heterocycloalkyl, heterocycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, arylcycloalkyl, OR 7 , —CN, —C(O)R 7 , —C(O)OR 7 , —S(O) 2 R 7 , —C(O)N(R 8 ) 2 , —S(O)N(R 8 ) 2 , —S(O) 2 N(R 8 ) 2 , —NO 2 , and —N(R 8 ) 2 ;

each R 9 (when present) is independently selected from the group consisting of: halogen, —CN, —NO 2 , —Si(R 6 ) 3 , —P(O)(OR 7 ) 2 , —P(O)(OR 7 )(R 7 ), —N(R 8 ) 2 , —NR 8 C(O)R 7 , —NR 8 S(O) 2 R 7 , —NR 8 C(O)N(R 8 ) 2 , —NR 8 C(O)OR 7 , —C(O)R 7 , —C(O) 2 R 7 , —C(O)N(R 8 ) 2 , —S(O)R 7 , —S(O) 2 R 7 , —S(O) 2 N(R 8 ) 2 , —OR 7 , —SR 7 , alkyl, haloalkyl, heteroalkyl, alkenyl, alkynyl, aryl, arylalkyl-, cycloalkyl, heteroaryl, heteroarylalkyl-, and heterocycloalkyl;

each R 10 (when present) is independently selected from the group consisting of halo, —CN, —NO 2 , —Si(R 6 ) 3 , —P(O)(OR 7 ) 2 , —P(O)(OR 7 )(R 7 ), —N(R 8 ) 2 , —NR 8 C(O)R 7 , —NR 8 S(O) 2 R 7 , —NR 8 C(O)N(R 8 ) 2 , —NR 8 C(O)OR 7 , —C(O)R 7 , —C(O) 2 R 7 , —C(O)N(R 8 ) 2 , —S(O)R 7 , —S(O) 2 R 7 , —S(O) 2 N(R 8 ) 2 , —OR 7 , —SR', alkyl, haloalkyl, haloalkoxy, heteroalkyl, alkenyl, alkynyl, and cycloalkyl,

wherein each said alkyl, haloalkyl, haloalkoxy, heteroalkyl, alkenyl, alkynyl, and cycloalkyl of R 10 (when present) is optionally independently unsubstituted or further substituted with one or more independently selected groups selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower heteroalkyl, halo, —CN, —NO 2 , —N(R 8 ) 2 , and —C(O)N(R 8 ) 2 ; and

each R 11 is independently selected from the group consisting of —SF 5 and —OSF 5 .

2. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:

R 1 is selected from the group consisting of H, lower alkyl, and cyclopropyl.

3. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:

R 2 is H.

4. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:

R 3 is selected from the group consisting H, alkyl, haloalkyl, and heteroalkyl.

5. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, said compound having a structural Formula (II):

6. A compound of claim 5 , or a pharmaceutically acceptable salt thereof, wherein:

ring A is selected from the group consisting of phenyl, pyridyl, pyrazinyl, furanyl, thienyl, pyrimidinyl, pyridazinyl, thiazolyl, oxazolyl, benzothienyl, benzimidazolyl, and indazolyl;

m is 0 or more;

q is 0, 1, or 2;

each R 5 group (when present) is independently selected from the group consisting of halogen, —CN, —N(R 8 ) 2 , —OR 7 , —SR 7 , lower alkyl, lower haloalkyl, lower heteroalkyl, lower alkynyl, and cycloalkyl;

n is 1;

r is 0, 1, or 2;

-L 3 - is present or absent and when present represents a divalent moiety selected from the group consisting of —NHC(O)— and —C(O)NH—;

ring B is selected from the group consisting of phenyl, pyridyl, pyrazinyl, furanyl, thienyl, pyrimidinyl, pyridazinyl, thiazolyl, and oxazolyl;

p is 0 or more;

and

each R 9 group (when present) is independently selected from the group consisting of halogen, —CN, —N(R 8 ) 2 , —OR 7 , —SR 7 , lower alkyl, lower haloalkyl, lower heteroalkyl, lower alkynyl, phenyl, benzyl, and cycloalkyl;

with the provisos that:

(i) the sum of m and q is the maximum value of substitutable hydrogen atoms on ring A;

(ii) the sum of p and r is the maximum number of available substitutable hydrogen atoms on ring B; and

(ii) the sum of q and r is 1 or 2.

7. A compound of claim 5 , or a pharmaceutically acceptable salt thereof, wherein:

n is 1;

q is 0, 1, or 2;

m is 0 or more;

p is 0 or more;

r is 0, 1, or 2;

ring A is selected from the group consisting of phenyl, pyridyl, thienyl, benzthienyl, and benzimidazolyl;

each R 5 group (when present) is independently selected from the group consisting of halogen, —CN, —N(R 8 ) 2 , —OR 7 , —SR 7 , lower alkyl, lower haloalkyl, lower heteroalkyl, lower alkynyl, and cyclopropyl;

-L 3 - is present or absent and when present represents a divalent moiety selected from the group consisting of —NHC(O)— and —C(O)NH—;

ring B is selected from the group consisting of phenyl, pyridyl, thienyl, pyrimidinyl, and pyrazinyl; and

each R 9 group (when present) is independently selected from the group consisting of halogen, —CN, —N(R 8 ) 2 , —OR 7 , —SR 7 , lower alkyl, lower haloalkyl, lower heteroalkyl, lower alkynyl, phenyl, benzyl, and cyclopropyl;

with the provisos that:

(i) the sum of q and r is 1 or 2;

(ii) the maximum value of the sum of m, n and q is the maximum number of available substitutable hydrogen atoms on ring A; and

(iii) the maximum value of the sum of p and r is the maximum number of substitutable hydrogen atoms on ring B.

8. A compound, or a stereoisomer thereof, or a pharmaceutically acceptable salt of said compound or said stereoisomer, said compound being selected from the group consisting of:

Example No.

Structure:

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

9. A pharmaceutical composition comprising at least one compound of claim 1 , or pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier or diluent.

10. A pharmaceutical composition comprising a compound of claim 1 , or pharmaceutically acceptable salt thereof, together with at least one additional therapeutic agent, and a pharmaceutically acceptable carrier or diluent.

11. A pharmaceutical composition of claim 10 , wherein said at least one additional therapeutic agent is at least one agent selected from:

m 1 agonists; m 2 antagonists; cholinesterase inhibitors; galantamine; rivastigimine; N-methyl-D-aspartate receptor antagonists; combinations of cholinesterase inhibitors and N-methyl-D-aspartate receptor antagonists; gamma secretase modulators; gamma secretase inhibitors; non-steroidal anti-inflammatory agents; anti-inflammatory agents that can reduce neuroinflammation; anti-amyloid antibodies; vitamin E; nicotinic acetylcholine receptor agonists; CB1 receptor inverse agonists; CB1 receptor antagonists; antibiotics; growth hormone secretagogues; histamine H3 antagonists; AMPA agonists; PDE4 inhibitors; GABA A inverse agonists; inhibitors of amyloid aggregation; glycogen synthase kinase beta inhibitors; promoters of alpha secretase activity; PDE-10 inhibitors; Tau kinase inhibitors; Tau aggregation inhibitors; RAGE inhibitors; anti-Abeta vaccine; APP ligands; agents that upregulate insulin, cholesterol lowering agents; cholesterol absorption inhibitors; combinations of HMG-CoA reductase inhibitors and cholesterol absorption inhibitors; fibrates; combinations of fibrates and cholesterol lowering agents and/or cholesterol absorption inhibitors; nicotinic receptor agonists; niacin; combinations of niacin and cholesterol absorption inhibitors and/or cholesterol lowering agents; LXR agonists; LRP mimics; H3 receptor antagonists; histone deacetylase inhibitors; hsp90 inhibitors; 5-HT4 agonists; 5-HT6 receptor antagonists; mGluR1 receptor modulators or antagonists; mGluR5 receptor modulators or antagonists; mGluR2/3 antagonists; Prostaglandin EP2 receptor antagonists; PAI-1 inhibitors; agents that can induce Abeta efflux; Metal-protein attenuating compound; GPR3 modulators; and antihistamines.